Question

Water reaches the wellhead of a single flash geothermal plant at 2.0 MPa, 210°C, and 22.5 kg/s. The water is flashed to 800 kPa. The vapor portion goes through a turbine with an isentropic efficiency of 90% and the condenser pressure is 10 kPa. Both pumps have efficiencies of 68% and the injection well pressure is 4.0 MPa. Determine: a. The power produced by the turbine, in kW b. The total pump power input, in kW. c. The rate of heat input in the earth or "boiler," in kW d. The overall efficiency

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